Článek
11/18/2011

BitmapImage Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Provides the practical object source type for the Image.Source and ImageBrush.ImageSource properties.

Inheritance Hierarchy

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.ImageSource
      System.Windows.Media.Imaging.BitmapSource
        System.Windows.Media.Imaging.BitmapImage

Namespace: System.Windows.Media.Imaging
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
Public NotInheritable Class BitmapImage _
    Inherits BitmapSource

public sealed class BitmapImage : BitmapSource

<BitmapImage .../>

The BitmapImage type exposes the following members.

Constructors

	Name	Description
	BitmapImage()	Initializes a new instance of the BitmapImage class.
	BitmapImage(Uri)	Initializes a new instance of the BitmapImage class, using the supplied URI.

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Properties

	Name	Description
	CreateOptions	Gets or sets the BitmapCreateOptions for a BitmapImage.
	Dispatcher	Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
	PixelHeight	Gets the height of the bitmap in pixels. (Inherited from BitmapSource.)
	PixelWidth	Gets the width of the bitmap in pixels. (Inherited from BitmapSource.)
	UriSource	Gets or sets the URI of the graphics source file that generated this BitmapImage.

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Methods

	Name	Description
	CheckAccess	Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
	ClearValue	Clears the local value of a dependency property. (Inherited from DependencyObject.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetAnimationBaseValue	Returns any base value established for a Silverlight dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetValue	Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ReadLocalValue	Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
	SetSource	Sets the source of the BitmapSource. (Inherited from BitmapSource.)
	SetValue	Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Events

	Name	Description
	DownloadProgress	Occurs when a significant change has occurred in the download progress of the BitmapImage content.
	ImageFailed	Occurs when there is an error associated with image retrieval or format.
	ImageOpened	Occurs when the image source is downloaded and decoded with no failure. You can use this event to determine the size of an image before rendering it.

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Extension Methods

	Name	Description
	CopyTo(Texture2D)	Overloaded. Copies a bitmap image to a texture. (Defined by BitmapSourceExtensions.)
	CopyTo(TextureCube, CubeMapFace)	Overloaded. Copies a bitmap image to a cube map face. (Defined by BitmapSourceExtensions.)
	CopyTo(Texture2D, Int32, Nullable<Rectangle>, Int32, Int32)	Overloaded. Copies a sub-region of bitmap to a sub-region of the texture. (Defined by BitmapSourceExtensions.)
	CopyTo(TextureCube, CubeMapFace, Int32, Nullable<Rectangle>, Int32, Int32)	Overloaded. Copies a sub-region of bitmap to a sub-region of the cube map face. (Defined by BitmapSourceExtensions.)

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Fields

	Name	Description
	CreateOptionsProperty	Identifies the CreateOptions dependency property.
	UriSourceProperty	Identifies the UriSource dependency property.

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Remarks

The BitmapImage can be used to reference images in the JPEG and PNG file formats.

If the Image.Source property is set to an invalid format, or is specified to a URI that cannot be resolved, then the ImageFailed event is raised.

There are two ways to specify the graphics content for a BitmapImage: by URI, or by stream. You can set with either of these, and the behavior is that the last technique used will specify the content.

XAML usage for BitmapImage as an object element is uncommon, because it would only be appropriate for setting a BitmapImage as the object element within a property element usage for setting Image.Source. More typically you would use Image and use the URI to set Image.Source as an attribute.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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